From Longman Dictionary of Contemporary Englisharmbandarm‧band /ˈɑːmbænd $ ˈɑːrm-/ noun [countable]1DCa band of material that you wear around your arm to show that you have an officialposition, or as a sign of mourning2[usually plural] British EnglishDSS one of two bands of plastic filled with air that you wear around your arms when you are learning to swim syn waterwings